<?php

namespace Kanboard\Export;

use Kanboard\Core\Base;
use Kanboard\Core\DateParser;
use Kanboard\Model\Task;
use PDO;

/**
 * Task Export
 *
 * @package  export
 * @author   Frederic Guillot
 */
class TaskExport extends Base
{
    /**
     * Fetch tasks and return the prepared CSV
     *
     * @access public
     * @param  integer    $project_id      Project id
     * @param  mixed      $from            Start date (timestamp or user formatted date)
     * @param  mixed      $to              End date (timestamp or user formatted date)
     * @return array
     */
    public function export($project_id, $from, $to)
    {
        $tasks = $this->getTasks($project_id, $from, $to);
        $swimlanes = $this->swimlane->getList($project_id);
        $results = array($this->getColumns());

        foreach ($tasks as &$task) {
            $results[] = array_values($this->format($task, $swimlanes));
        }

        return $results;
    }

    /**
     * Get the list of tasks for a given project and date range
     *
     * @access public
     * @param  integer    $project_id      Project id
     * @param  mixed      $from            Start date (timestamp or user formatted date)
     * @param  mixed      $to              End date (timestamp or user formatted date)
     * @return array
     */
    public function getTasks($project_id, $from, $to)
    {
        $sql = '
            SELECT
            tasks.id,
            projects.name AS project_name,
            tasks.is_active,
            project_has_categories.name AS category_name,
            tasks.swimlane_id,
            columns.title AS column_title,
            tasks.position,
            tasks.color_id,
            tasks.date_due,
            creators.username AS creator_username,
            users.username AS assignee_username,
            users.name AS assignee_name,
            tasks.score,
            tasks.title,
            tasks.date_creation,
            tasks.date_modification,
            tasks.date_completed,
            tasks.date_started,
            tasks.time_estimated,
            tasks.time_spent
            FROM tasks
            LEFT JOIN users ON users.id = tasks.owner_id
            LEFT JOIN users AS creators ON creators.id = tasks.creator_id
            LEFT JOIN project_has_categories ON project_has_categories.id = tasks.category_id
            LEFT JOIN columns ON columns.id = tasks.column_id
            LEFT JOIN projects ON projects.id = tasks.project_id
            WHERE tasks.date_creation >= ? AND tasks.date_creation <= ? AND tasks.project_id = ?
            ORDER BY tasks.id ASC
        ';

        if (! is_numeric($from)) {
            $from = $this->dateParser->removeTimeFromTimestamp($this->dateParser->getTimestamp($from));
        }

        if (! is_numeric($to)) {
            $to = $this->dateParser->removeTimeFromTimestamp(strtotime('+1 day', $this->dateParser->getTimestamp($to)));
        }

        $rq = $this->db->execute($sql, array($from, $to, $project_id));
        return $rq->fetchAll(PDO::FETCH_ASSOC);
    }

    /**
     * Format the output of a task array
     *
     * @access public
     * @param  array     $task        Task properties
     * @param  array     $swimlanes   List of swimlanes
     * @return array
     */
    public function format(array &$task, array &$swimlanes)
    {
        $colors = $this->color->getList();

        $task['is_active'] = $task['is_active'] == Task::STATUS_OPEN ? e('Open') : e('Closed');
        $task['color_id'] = $colors[$task['color_id']];
        $task['score'] = $task['score'] ?: 0;
        $task['swimlane_id'] = isset($swimlanes[$task['swimlane_id']]) ? $swimlanes[$task['swimlane_id']] : '?';

        $task = $this->dateParser->format($task, array('date_due', 'date_modification', 'date_creation', 'date_started', 'date_completed'), DateParser::DATE_FORMAT);

        return $task;
    }

    /**
     * Get column titles
     *
     * @access public
     * @return string[]
     */
    public function getColumns()
    {
        return array(
            e('Task Id'),
            e('Project'),
            e('Status'),
            e('Category'),
            e('Swimlane'),
            e('Column'),
            e('Position'),
            e('Color'),
            e('Due date'),
            e('Creator'),
            e('Assignee Username'),
            e('Assignee Name'),
            e('Complexity'),
            e('Title'),
            e('Creation date'),
            e('Modification date'),
            e('Completion date'),
            e('Start date'),
            e('Time estimated'),
            e('Time spent'),
        );
    }
}
